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Power Systems

Power Systems
A loss less transmission line has a length of 600 km, find the phase shift of voltage signal?

 36°
 45°
 42°
 90°

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Power Systems
In a 220 kV system, the inductance and capacitance up to the circuit breaker location are 25 mH and 0.025 µF respectively. The value of resistor required to be connected across the breaker contacts which will give no transient oscillations, is

 500 Ω
 1000 Ω
 250 Ω
 25 Ω

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Power Systems
A hydro power plant of run off river type should be provided with pondage so that the

 operating head is controlled.
 pressure inside the turbine casing remains.
 kinetic energy of the running water is fully utilized.
  firm capacity of plant is increased.

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Power Systems
Isolator in sub station is open under ------------- condition?

 short circuit
 no load
 any of the above
 full load

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Power Systems
A thermal generating station has an installed capacity of 15 MW and supplies a daily load of 10 MW for 12 hours and 5 MW for remaining 12 hours. If the load factor is 0.8. Find the reserve capacity of the station?

 9 MW
 10 MW
 18 MW
 5 MW

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Power Systems
The essential requirement(s) for power plants to be operated as peak load plants are

All of these
 Quick response to load variation.
 Low capital cost.
 Capability of quick starts.

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